But people like Claudia Ferrell and Denver Water are certain it means change.

The report also says climate change has led to an historic increase in bark beetle outbreak—the greatest in the last 125 years. Warmer winters allow more beetles to survive winter, completing two life cycles in a season, rather than one.

And people’s health could also be affected. Excessive heat can aggravate respiratory or heart disease. And heat waves are often accompanied by increased ground-level ozone, which can cause respiratory distress. Longer warm seasons can also lead to more disease-transmitting mosquitoes.